<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
  
  span {
    display: block;
  }
  .box {
    font-size: 32px;
    font-weight: 700;
    margin: 22px 0;
  }
  </style>
</head>
<body>
  
<h1>我是h1元素</h1>
<p>我是p元素</p>
<div>
  我是div元素
</div>
<span>我是span元素</span>
<!--用div来模拟h1元素-->
<div class="box">我也是div元素</div>
</body>
</html>